Enhancement of PVDF/LiCl membrane performance by modifying the membrane surface using zeolite NaY and ZCC spray coating method for Dunaliella salina microalgae dewatering

Nurul Widiastuti*, Ellyzia Sukma Ningtiar, Fitrin Nafilah, Badrut Tamam Ibnu Ali, Adi Setyo Purnomo, Taufik Qodar Romadiansyah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Utilization of Dunaliella salina microalgae as a raw material for bioethanol production encountered problems in terms of harvesting microalgae. The dilute solution and the size of the microalgae are too small to be a challenge in harvesting microalgae. In this study, the surface modification of PVDF/LiCl membrane with Zeolite NaY and Zeolite-Carbon Composite (ZCC) was carried out by spray coating for harvesting Dunaliella salina microalgae. Zeolite NaY was synthesized by hydrothermal method at 100 °C for 7 h and ZCC was synthesized by sucrose impregnation on zeolite. All membranes were characterized using Scanning Electron Microscope (SEM) and Fourier Transform Infra Red (FTIR) instruments, as well as Water Contact Angle (WCA) test and membrane performance test for harvesting Dunaliella salina microalgae The results showed that Zeolite NaY and ZCC coatings have been shown to increase the hydrophilicity and performance of PVDF/LiCl membranes for harvesting Dunaliella salina microalgae. The increase in the hydrophilicity of the membrane was indicated by decreasing the contact angle of the PVDF/LiCl membrane from 84.14° to 69.2° for 0.10% PVDF/LiCl/ZCC membrane. The coating of zeolite NaY 0.15% into PVDF/LiCl membrane enhanced the permeability from 148.53 ± 32.98 L/m2h to 173.40 ± 8.42 L/m2h, while the coating of 0.10% ZCC into PVDF/LiCl membrane enhanced the water permeability into 208.48 ± 27.99 L/m2h. Furthermore, the selectivity also increased from 97.64% to 100% rejection in microalgae dewatering process. This shows that selectively modified zeolite NaY and ZCC membranes are only able to pass seawater as a microalgae culture medium.

Original languageEnglish
Pages (from-to)2940-2945
Number of pages6
JournalMaterials Today: Proceedings
Volume65
DOIs
Publication statusPublished - Jan 2022

Keywords

  • Microalgae dewatering
  • PVDF/LiCl membrane
  • Spray coating
  • Zeolite NaY
  • Zeolite-carbon composite

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